Sensorless Research On Interior Permanent Magnet Synchronous Motor Based On Disturbance Observer

With the increasingly prominent problem of power energy,the efficient andenergy-saving motor and its advanced control technology have been vigorously developed under the background of environmental protection and energy saving.Interior permanent magnet synchronous motor(IPMSM)is widely used because of its advantages,such as energy saving,high reliability,wide speed range and high efficiency.Sensorless technology is an advanced technology in IPMSM control.This technology can replace the traditional position sensor to obtain the rotor position information,and control IPMSM.But,the existing IPMSM’s position sensorless technology still has many problems such as complex model and low location information accuracy.In this paper,a IPMSM sensorless control method based on improved disturbance observer is proposed.In the two phase stationary coordinate system,the synthetic back electromotive force is defined as disturbance quantity,and an improved disturbance observer model of IPMSM is established.This model using intermediate variables was capable of estimating the system disturbance accurately without calculating the state vector derivation or inserting noise filter.According to the estimated results,the accurate location information is obtained by the phase locked loop(PLL)and phase compensation.At the same time,the IPMSM control is realized by combining the maximum torque per ampere(MTPA)and voltage space vector pulse width modulation(SVPWM).According to the IPMSM parameters,a system model is built under the Matlab/Simulink platform,and the system waveforms under different conditions are simulated and analyzed.The results show that the IPMSM sensorless control method based on disturbance observer is easy to debug,can accurately estimate the rotor position information and achieve high performance control.Finally,the hardware and software design of the system is completed,the hardware control platform based on TMS320F28335 is built,and the control program of CCSv5.0 software is combined to verify the feasibility of the IPMSM sensorless control based on the disturbance observer.